we know that

Since, we have to find 1 foot^2
so, we will take square both sides



so, we can see that it is not equal to 12 inch^2
that's why
is not true
There are total (3r + 4g + 2b) = 9 balls in the bag . Two balls are drawn, our event happens if exactly one of them is a green ball. The required probability of happening of the required event is, therefore
= {C(4, 1)xC(5, 1)}/ C(9, 2) = (5x4)/36
= 5/9 .
i think answer are big enough